1
FN9001.4
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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IS-1845ASRH
Single Event Radiation Hardened
High Speed, Current Mode PWM
The IS-1845ASRH is designed to be
used in switching power supplies
operating in current-mode. The
rising edge of the on-chip oscillator
turns on the output. Turn-off is controlled by the current
sense comparator and occurs when the sensed current
reaches a peak controlled by the error amplifier.
Constructed with Intersil’s Rad Hard Silicon Gate (RSG)
dielectrically isolated BiCMOS process, these devices are
immune to single event latch-up and have been specifically
designed to provide a high level of immunity to single event
transients. All specified parameters are guaranteed and
tested for 300krad(Si) total dose performance.
Detailed Electrical Specifications for these devices are
contained in SMD 5962-01509. A “hot-link” is provided on
our website for downloading the SMD.
Features
Electrically Screened to DSCC SMD # 5962-01509
QML Qualified per MIL-PRF-38535 Requirements
Radiation Environment
- Total Dose. . . . . . . . . . . . . . . . . . . . . 300 krad(SI) (Max)
- SEL Immune. . . . . . . . . . . . . . . . . Dielectrically Isolated
- SEU Immune . . . . . . . . . . . . . . . . . . . . 35MeV/mg/cm2
- SEU Cross-Section at 89MeV/mg/cm2. . . . 5 x 10-6cm2
Low Start-up Current . . . . . . . . . . . . . . . . . . . 100A (Typ)
Fast Propagation Delay . . . . . . . . . . . . . . . . . . 80ns (Typ)
Supply Voltage Range . . . . . . . . . . . . . . . . . . . 12V to 20V
High Output Drive. . . . . . . . . . . . . . . . . . . . 1A (Peak, Typ)
Undervoltage Lockout . . 8.8V Start (Typ), 8.2V Stop (Typ)
Applications
Current-Mode Switching Power Supplies
Control of High Current FET Drivers
Motor Speed and Direction Control
TM
Pinouts
IS7-1845ASRH
(8 LD CDIP2-T8 SBDIP)
TOP VIEW
IS9-1845ASRH
(18 LD FLATPACK)
TOP VIEW
NOTES:
1. Grounding the Comp pin does not inhibit the output. The output may be inhibited by applying >1.2V to the ISENSE pin.
2. This part should be operated with Ct = 3.3nF and Rt = 10k timing components only.
COMP
VFB
ISENSE
RTCT
1
2
3
4
8
7
6
5
VREF
VCC
OUT
GND
COMP
VFB
NC
ISENSE
RTCT
NC
3
4
5
6
7
8
9
217
16
15
14
13
12
11
10
VREF
VCC
VC
OUT
NC
GND
OSCGND
NC
1
18
NC
Data Sheet
September 25, 2008